Pope Gregory XIII

2) 1502 - 1585
3) heliocentric
4) Gregory XIII is best known for his reformation of the calendar, producing the Gregorian calender
5) http:// en.wikipedia.org/ wiki/Pope_Gregory_XIII #The_Gregorian_Calendar

Nicolaus Copernicus

2) 1473 - 1543
3) heliocentric
4) first to formulate a comprehensive heliocentric cosmology
5) http://en.wikipedia.org/wiki/Copernicus

Isaac Newton

2) 1643 -1727
3) heliocentric
4) created the laws for physics now known as newtons laws
5)
http://en.wikipedia.org/wiki/Isaac_Newton

Tycho Brahe

2) 1546 -1601
3) heliocentric
4) He was the first to ever describe a supernova and had the first true astronomical observatory
5) http://www.answers.com/topic/tycho-brahe

Johannes Kepler

2) 1571 -1630
3) Heliocentric
4) He is best known for his eponymous law of planetary motion
5) answers.com & http://en.wikipedia.org/wiki/Johannes_Kepler

Galileo

2) 1564 - 1642
3) Heliocentric
4) played a major role in scientific revolution
5) http://en.wikipedia.org/wiki/Galileo_Galilei

Hipparchus

2) 190 B.C. - 120B.C.
3)Geocentric
4)He the only one whose quantitative and accurate models for the motion of the sun and the moon are still in use today
5) http://en.wikipedia.org/wiki/Hipparchus

Aristotle

2) 384 B.C. - 322 B.C.
3) Geocentric
4) helped to start physics and the common math we use today
5) http://en.wikipedia.org/wiki/Aristotle

first post

My name is Jacob meyer. I am a junior at West Delaware High Shcool in Manchester Iowa. I play football for the Hawks who had an alright 08 season that ended after a loss to decorah in the second round of the playoffs.

In my free time i like to golf, hang with friends, and play video games. One of my favorite games to play is Madden 09 and i demolish everyone i play. My favoriter team is the Minnesota Vikings.